add icons for Character groups

www/analytics/plugins/Feedback/angularjs/ratefeature/icon_license

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+thumbs-up.png
+https://www.iconfinder.com/icons/83403/thumbs_up_icon#size=32
+Creative Commons (Attribution-Share Alike 3.0 Unported)
+
+thumbs-down.png
+https://www.iconfinder.com/icons/83402/down_thumbs_icon#size=32
+Creative Commons (Attribution-Share Alike 3.0 Unported)

www/analytics/plugins/Feedback/angularjs/ratefeature/ratefeature-controller.js

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+/*!
+ * Piwik - Web Analytics
+ *
+ * @link http://piwik.org
+ * @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
+ */
+
+angular.module('piwikApp').controller('RateFeatureController', function($scope, rateFeatureModel, $filter){
+
+    $scope.dislikeFeature = function () {
+        $scope.like = false;
+    };
+
+    $scope.likeFeature = function () {
+        $scope.like = true;
+    };
+
+    $scope.sendFeedback = function (message) {
+        rateFeatureModel.sendFeedbackForFeature($scope.title, $scope.like, message);
+        $scope.ratingDone = true;
+        // alert($filter('translate')('Feedback_ThankYou'));
+    };
+});

www/analytics/plugins/Feedback/angularjs/ratefeature/ratefeature-directive.js

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+/*!
+ * Piwik - Web Analytics
+ *
+ * @link http://piwik.org
+ * @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
+ */
+
+/**
+ * Usage:
+ * <div piwik-rate-feature title="My Feature Name">
+ */
+angular.module('piwikApp').directive('piwikRateFeature', function($document, piwik, $filter){
+
+    return {
+        restrict: 'A',
+        scope: {
+            title: '@'
+        },
+        templateUrl: 'plugins/Feedback/angularjs/ratefeature/ratefeature.html?cb=' + piwik.cacheBuster,
+        controller: 'RateFeatureController'
+    };
+});

www/analytics/plugins/Feedback/angularjs/ratefeature/ratefeature-model.js

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+/*!
+ * Piwik - Web Analytics
+ *
+ * @link http://piwik.org
+ * @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
+ */
+
+angular.module('piwikApp').factory('rateFeatureModel', function (piwikApi) {
+
+    var model = {};
+
+    model.sendFeedbackForFeature = function (featureName, like, message) {
+        return piwikApi.fetch({
+            method: 'Feedback.sendFeedbackForFeature',
+            featureName: featureName,
+            like: like ? '1' : '0',
+            message: message + ''
+        });
+    };
+
+    return model;
+});

www/analytics/plugins/Feedback/angularjs/ratefeature/ratefeature.html

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+<div title="{{ 'Feedback_RateFeatureTitle'|translate:title }}" class="ratefeature">
+
+    <div class="iconContainer"
+         ng-mouseenter="view.expanded=true;"
+         ng-mouseleave="view.expanded=false">
+
+        <img ng-click="likeFeature();view.showFeedbackForm=true;"
+             class="like-icon"
+             src="plugins/Feedback/angularjs/ratefeature/thumbs-up.png"/>
+
+        <img ng-click="dislikeFeature();view.showFeedbackForm=true;"
+             class="dislike-icon"
+             ng-show="view.expanded"
+             src="plugins/Feedback/angularjs/ratefeature/thumbs-down.png"/>
+    </div>
+
+    <div class="ui-confirm ratefeatureDialog" piwik-dialog="view.showFeedbackForm" yes="sendFeedback(view.feedbackMessage)">
+        <h2>{{ 'Feedback_RateFeatureThankYouTitle'|translate:title }}</h2>
+        <p ng-if="like">{{ 'Feedback_RateFeatureLeaveMessageLike'|translate }}</p>
+        <p ng-if="!like">{{ 'Feedback_RateFeatureLeaveMessageDislike'|translate }}</p>
+        <br />
+
+        <div class="messageContainer">
+            <textarea ng-model="view.feedbackMessage"></textarea>
+        </div>
+
+        <input type="button"
+               title="{{ 'Feedback_RateFeatureSendFeedbackInformation'|translate }}"
+               value="{{ 'Feedback_SendFeedback'|translate }}" role="yes"/>
+    </div>
+
+    <div class="ui-confirm ratefeatureDialog" piwik-dialog="ratingDone" yes="">
+        <h2>{{ 'Feedback_ThankYou'|translate:title }}</h2>
+
+        <input type="button" value="{{ 'General_Ok'|translate }}" role="yes"/>
+    </div>
+
+</div>

www/analytics/plugins/Feedback/angularjs/ratefeature/ratefeature.less

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+.ratefeatureDialog {
+  text-align: center;
+
+  textarea {
+    margin-top: 5px;
+    width: 100%;
+    height: 80px;
+  }
+}
+
+.ratefeature {
+
+  font-size: 1px;
+
+  .iconContainer {
+    display: inline-block;
+  }
+
+  .dislike-icon,
+  .like-icon {
+    opacity: 0.2;
+    width: 22px;
+    height: 22px;
+    cursor: pointer;
+
+    &:hover {
+      opacity: 0.9;
+    }
+  }
+}